//let 变量名：数据类型 = 值

//let flag: boolean = true;

//console.log(flag)
//const foo: string = "abc"
//console.log(foo)
//const str: string = "ok"
//console.log(str);

//数字类型 ------》number
//let a1: number = 10 //二进制
//let a2: number = 0b1010 //六进制
//let a3: number = 0o12  //八进制
//let a4: number = 0xa //十六进制

//console.log(a1);
//console.log(a2);
//console.log(a3);
//console.log(a4);

//function greeter(person) {
//    return 'hello' + person
//}
//let user = 'yee'
//console.log(greeter(user));


